FITS JACOBS CHUCK MODELS 7, 7-1A, 7B, 7BA 3/8 CHUCKS AND MILWAUKEE 1/4" CHUCKS 48-66-0070, 48-66-0104, 48-66-0230. THIS WILL MAKE THE KEY SEEM NOT TO FIT OR THE PILOT ON YOUR CHUCK KEE MAY SEEM TO BE TOO BIG.
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